Gas Lead Additive
Burning Brakes
Joined: Sep 2005
Posts: 755
Likes: 1
From: Hobart Tasmania
I use premium unleaded 95% and also put in a flash lube, the heads have hardened seats. I know it isn't really necessary but I want keep the BB going for as long as possible and the little miles it runs up doesn't matter in cost. I also don't pay for the flash lube.
CF Community Team
Joined: Oct 2004
Posts: 19,360
Likes: 5,243
From: Cape Cod, Mass.
2025 C6 of the Year Finalist - Unmodified
2025 C8 Z06/7/E-Ray of the Year Finalist - Unmodified
2023 C3 of the Year Finalist - Unmodified
2021 C8 of the Year Finalist Unmodified
2020 Corvette of the Year Finalist (performance mods)
2019 C1 of Year Winner (performance mods)
2017 Corvette of the Year Finalist
2016 C2 of Year
2015 C3 of Year Finalist
No. The need for lead in these older engines is a myth. I run my 68 427 on unleaded 93. No problems. My 65 350 horse with 11:1 compression runs better on unleaded than it did on leaded. No hardened valve seats in either engine. The 65's engine was last rebuilt in 87. No problems.
